JP2011106908A - Display device and wrist watch - Google Patents

Abstract

To provide a display device and a wrist watch that can be easily assembled and can reliably prevent a dark purple color of a solar cell from being visually recognized from the outside.
SOLAR CELL 61, SUPPORTING SUBSTRATE 62 FOR SUPPORTING THE SOLAR CELL, LOCATED ON THE BACK SIDE OF THE SOLAR CELL 61, GROOVE 71 AND FLAT POTTERY 60B ON A SURFACE CELL ON THE SURFACE CELL, AND FORMED ON THE SURFACE And a dial plate 7 which is a light-transmitting member having a light reflecting coating 60d formed in the concave portion 60b. The solar cell 61, the support substrate 62 and the dial plate 7 are integrated by adhesion, and a flat portion 72 from the outside. The light is transmitted to the solar cell 61 so that the light is effectively generated. On the other hand, the light reflection coating 71 blocks light from the solar cell 61 from being transmitted to the outside. Can be reliably prevented from being seen from the outside.
[Selection] Figure 2

Description

  The present invention relates to a display device having a solar cell and a wristwatch.

In a wristwatch with a solar cell, a solar cell is installed on the back side of the dial. Therefore, it is necessary that the dial is made of a light transmissive member, and external light is guided to the solar cell through the dial on the surface side. However, the background color of the solar cell has a unique dark purple color. When the dial is formed of a light-transmitting member, the dark purple color that is the background color of the solar cell is visually recognized from the outside of the watch glass.
Therefore, conventionally, a prism reflection surface is formed on the lower surface of the dial, and a reflection type polarizing plate is provided on the back side of the dial, and the dark purple color of the solar cell provided on the back side of the reflection type polarizing plate is erased. A dial plate with a solar cell configured so that dark purple is not visually recognized from the outside of the watch glass is known (for example, Patent Document 1).

JP 2006-189019 A

However, in the invention described in Patent Document 1, since the prism reflection surface is formed on the lower surface of the dial and the peak portion is sharp, it is difficult to integrate the dial and the reflective polarizing plate. In addition, there is a problem that the dial and the reflective polarizing plate need to be arranged with a predetermined gap in order to obtain an appropriate effect, so that the assembly becomes complicated.
An object of the present invention is to provide a display device and a wristwatch that can be easily assembled and can reliably prevent a dark purple color of a solar cell from being visually recognized from the outside.

The invention of claim 1
In a display device including a solar cell, a support substrate disposed on the back side of the solar cell and supporting the solar cell, a concave portion formed uniformly on the surface and disposed on the front side of the solar cell, and a light reflecting coating formed on the concave portion. The solar cell, the support substrate, and the light transmissive member are integrated by adhesion.

  A second aspect of the present invention is the display device according to the first aspect, wherein the light transmitting member constitutes a decorative board.

  A third aspect of the present invention is the display device according to the first or second aspect, wherein a light-transmitting colored film is formed on the inner surface of the concave portion and the surface of the flat portion.

  According to a fourth aspect of the present invention, the display device according to any one of the first to third aspects is a wristwatch, a timepiece case that houses the light-transmissive member and the support substrate, and a timepiece glass that covers an upper portion of the timepiece case A wristwatch characterized by comprising:

The invention of claim 5
A method of manufacturing a display device including a solar cell,
Forming grooves having a V-shaped cross section on the surface of the light transmissive member in the form of a lattice vertically and horizontally;
Forming a light reflecting film with a predetermined film thickness on the surface of the light transmissive member in which grooves are formed by this step;
By this step, the surface of the light-transmitting member on which the light reflecting film is formed is cut to leave the groove valley portion, and a portion defined by the remaining valley portion is formed on a flat surface to form the flat surface. Removing the light reflecting coating on the surface and leaving the light reflecting coating only on the inner surface of the valley portion;
Arranging a solar cell and a support substrate supporting the solar cell in this order on the back side of the light transmissive member obtained by this step, and integrating them by bonding;
A display device manufacturing method characterized by comprising:

According to the present invention, the light transmissive member is integrally provided on the surface of the solar cell supported by the support substrate, and the concave portion and the flat portion are uniformly formed on the light transmissive member. Since the light reflection coating is formed on the solar cell, the light from the solar cell side is reflected by the light reflection coating on the concave portion of the light transmissive member, making it difficult to see from the outside. Can be inconspicuous. In addition, since a part of the external light can be transmitted through the flat portion of the light transmissive member and incident on the solar cell, the power generation function of the solar cell can be sufficiently achieved.
Moreover, according to this invention, external light is reflected and visually recognized by the light reflection film of the recessed part of a light transmissive member. In this case, if the light reflecting coating is formed of a metal coating, the concave portion is visually recognized as a metallic color, and a high-class feeling is created. Moreover, since the way of shining changes depending on how the light is applied and the viewing angle, a highly decorative product can be realized.
Furthermore, according to the present invention, since the light transmissive member and the solar cell are integrated by bonding, it is not necessary to adjust the distance between the light transmissive member and the solar cell during assembly, and the assembly is facilitated.
Further, according to the present invention, grooves having a V-shaped cross section are formed in a lattice shape vertically and horizontally on the surface of the light transmissive member, and the light reflecting film is formed on the surface of the light transmissive member with a predetermined film thickness. Forming and cutting the surface of the light transmissive member to leave a trough portion of the groove, and forming a portion defined by the trough portion on a flat surface to remove the light reflecting film on the flat surface. Since the light reflecting film is left only on the inner surface of the valley portion, and the solar cell and the support substrate for supporting the solar cell are provided on the back side of the light transmissive member and integrated, the dark purple of the solar cell is seen from the outside. It is possible to manufacture an integrated structure of a light-transmitting member and a solar cell structure that is inconspicuous.

It is a principal part expanded sectional view of the wristwatch concerning a 1st embodiment of this invention. It is sectional drawing which looked at the dial and solar cell structure of the wristwatch of FIG. 1 from the side. It is a figure which shows the surface state of the dial of FIG. It is side surface sectional drawing for demonstrating the manufacturing process of the dial plate of FIG. 2, and a solar cell structure. It is side surface sectional drawing for demonstrating the effect | action of the dial of FIG. 2, and a solar cell structure. It is a principal part expanded sectional view of the wristwatch concerning a 2nd embodiment of this invention. It is sectional drawing which looked at the dial of a wristwatch, the transparent member, and the solar cell structure of FIG. It is side surface sectional drawing for demonstrating the manufacturing process of the dial plate of FIG. 2, and a solar cell structure.

[First Embodiment]
The first embodiment will be described below with reference to FIGS.
FIG. 1 is an enlarged cross-sectional view of a main part of the wristwatch, and FIG. 2 is a cross-sectional view of the dial and solar cell structure of the wristwatch of FIG.
In FIG. 1, 1 is a wristwatch case. A watch glass 2 is attached to the upper surface of the wristwatch case 1, and a back cover 3 is attached to the lower surface via a waterproof ring 3a. A watch module 4 is housed inside the watch case 1. The timepiece module 4 includes a housing 5. A solar cell structure 6 and a dial plate 7 as a decorative plate are attached to the upper surface of the housing 5 by a presser plate 8. On the peripheral edge of the upper surface of the dial 7, time letters (mark parts) 12 such as numbers and figures representing 1 o'clock to 12 o'clock are provided.
An analog movement 9 is provided in the housing 5. The pointer shaft 10 of the analog movement 9 protrudes upward through a through hole 13 formed in the solar cell structure 6 and the dial plate 7, and hands 11 such as an hour hand and a minute hand are attached to the upper portion of the protruding pointer shaft 10. It has a structure.

The solar cell structure 6 includes a solar cell 61 and a support substrate 62 as shown in FIG. The support substrate 62 is disposed in a state of being superimposed on the back side of the solar cell 61 (contact state).
The solar cell 61 is not particularly limited, but one or a plurality of solar cells 61 are provided on the same plane. The support substrate 62 is for supporting the solar cell 61. A conductive pattern (not shown) is formed on the support substrate 62, and the solar cell 61 is connected to a secondary battery or the like disposed inside the housing 5 through the conductive pattern.

On the front side of the solar cell structure 6, the dial 7 is arranged in a superimposed state (contact state). The solar cell structure 6 and the dial 7 are integrated. The solar cell structure 6 and the dial 7 are integrated as follows.
For example, the solar cell 61 is formed in advance smaller than the support substrate 62 and the dial plate 7, and the solar cell 61 is sandwiched between the support substrate 62 and the dial plate 7, and the support substrate 62 is positioned outside the peripheral edge of the solar cell 61. And the dial 7 are bonded with an adhesive. Thereby, the solar cell structure 6 and the dial 7 are integrated.
Alternatively, adjacent ones of the support substrate 62, the solar cell 61, and the dial plate 7 are bonded together with an adhesive. Thereby, the solar cell structure 6 and the dial 7 are integrated. In this case, when the solar cell 61 and the dial 7 are bonded, it is preferable to use a light-transmitting adhesive. This is because the adhesive adheres to the surface of the solar cell 61, and therefore, in the case of an adhesive that does not have optical transparency, the arrival of light to the solar cell 61 is hindered. Therefore, when an adhesive that does not transmit light is used, it is preferable that the solar cell 61 and the dial plate 7 are bonded at a portion that does not hinder the arrival of light to the solar cell 61 as much as possible.

The dial 7 is formed of a plate made of transparent or translucent glass or synthetic resin. FIG. 3 is a plan view of the dial 7 before forming a colored film 74 described later. As shown in FIG. 3, grooves 71 having a V-shaped cross section are formed in a vertical and horizontal lattice pattern on the surface of the dial plate 7. A portion defined by the groove 71 having a V-shaped cross section in the dial 7 is a flat portion 72. It is preferable that the groove 71 and the flat portion 72 are uniformly formed in a portion covering the solar cell 61 other than the time character 12 and the surface decoration portion on the surface of the dial 7. This is because the time character 12 and the surface decoration portion have a relatively dark color, so that the solar cell 61 can be covered by itself.
Further, a light reflecting coating 73 is formed on the inner surface of the groove 71 having a V-shaped cross section of the dial 7. Each of the light reflecting coatings 73 is made of a metal such as aluminum or chromium, and is formed with a substantially uniform film thickness only on the inner surface of each groove 71. On the other hand, the light reflecting film 73 is not formed on the flat portion 72 of the dial 7.
Further, a light-transmitting colored film 74 is formed on the surface of the dial 7 so as to cover the surfaces of the grooves 71 and the flat portions 72. The colored film 74 is formed by printing, for example, by converting a resin containing a white pigment into ink.

Here, the groove 71 and the flat portion 72 having a V-shaped cross section are formed on the surface of the dial plate 7, but any pattern pattern having a concave portion and a flat portion 72 may be used. It may be a study pattern.
Further, the cross section of the recess is not limited to a V shape. For example, the cross section may be hemispherical.
Moreover, it is preferable to set the area of the recessed part and the flat part 72 and various dimensions (for example, thickness dimension) of the dial 7 so that about 50% light transmission and about 50% light reflection can be obtained as a whole.

Next, the manufacturing method of this dial plate 7 is demonstrated with reference to FIG.
First, as shown in FIG. 4A, grooves 710 having a V-shaped cross section are formed in a lattice shape vertically and horizontally on the surface of a light transmitting member 700 which is a starting member of the dial plate 7. At that time, although not particularly limited, the interval between the grooves 710 is set so that peaks and valleys are alternately formed when viewed from the side.
Next, as shown in FIG. 4B, a metal such as aluminum or chromium is vapor-deposited on the surface of the light transmissive member 700 to form a light reflective coating 730 with a substantially uniform film thickness.
Thereafter, as shown in FIG. 4C, only the tip of the mountain is cut together with the light reflecting coating 730 by a polishing operation or the like to form the tip of the mountain on a flat surface. Thereby, the flat part 720 is formed, the flat part 720 is exposed on the surface, and the light reflecting film 730 remains only on the inner surface of the valley. The light reflection coating 730 and the valley remaining only on the flat portion 720 and the inner surface of the valley finally become the flat portion 72, the light reflection coating 73, and the valley of the dial 7 (see FIG. 4E).
Next, as shown in FIG. 4D, a light-transmitting colored film 740 is formed over the entire surface of the light-transmitting member 700. The colored film 740 is formed by printing, for example. The colored film 740 finally becomes the colored film 74 of the dial 7 (see FIG. 4E).
Next, as illustrated in FIG. 4E, the time character 12 is printed on the surface of the portion corresponding to the flat portion 720 on the outer peripheral portion of the light transmissive member 700. Thereby, the dial plate 7 is completed.
Thereafter, the solar cell structure 6 and the dial 7 are integrated. The method of integration is as described above. Thereby, an integrated structure of the solar cell structure 6 and the dial 7 is obtained (see FIG. 2).
In addition, the manufacturing method of the dial 7 is not limited to the above.
For example, although the interval between the grooves 710 having a V-shaped cross section formed on the surface of the light transmissive member 700 is set so that peaks and valleys are alternately formed when viewed from the side, the interval between adjacent grooves 710 is set. By making the width larger than the groove width, a flat surface may be formed between the adjacent grooves 710 from the beginning.

According to the first embodiment, as shown in FIG. 5A, a part of the external light passes through each flat portion 72 of the dial 7 and enters the solar cell 61, as shown in FIG. The energy of light incident by the power generation action of each solar cell 61 is converted into electric energy, and an electric signal related to the converted electric energy is transmitted to a secondary battery or the like disposed inside the housing 5 through a conductive pattern. It can be charged or stored with power.
Further, as shown in FIG. 5A, a part of the external light is reflected by the light reflecting film 73 of the groove 71 of the dial 7 and is visually recognized from the outside. In this case, since the light reflecting coating 73 is formed of a metal coating, the portion of the light reflecting coating 73 has a metallic color through the colored film 74 (in this embodiment, the metallic color and the color of the colored film are mixed). As a result, it gives a sense of luxury. In addition, since the way of shining changes depending on the viewing angle and the angle of light, a highly decorative product can be realized.
Further, as shown in FIG. 5 (B), a part of the light reaching the solar cell 61 by external light is reflected by the surface of the solar cell 61. Of this, the light directed to the groove 71 of the dial 7 is a light reflecting film. 73, and is not emitted to the outside of the dial plate 7 (that is, shielded by the light reflecting film 73). Therefore, dark purple which is the ground color of the surface of the solar cell 61 is not conspicuous when viewed from the outside.
Furthermore, according to the first embodiment, since the dial 7 and the solar cell 61 are integrated by bonding, it is not necessary to adjust the distance between the dial 7 and the solar cell 61 during assembly, and the assembly is facilitated. .

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS.
6 is an enlarged cross-sectional view of a main part of the wristwatch according to the second embodiment, and FIG. 7 is a cross-sectional view of the dial, light transmitting member, and solar cell structure of the wristwatch of FIG.
The wristwatch according to the second embodiment is different from the wristwatch according to the first embodiment in the following points.
First, in the wristwatch of the second embodiment, the light-transmitting dial plate 7 and the solar cell structure 6 are separated from each other. It is integrated with the permeable member 14.
Secondly, in the wristwatch of the second embodiment, the V-shaped groove 71, the light reflecting film 73 and the colored film 74 are not formed on the surface of the dial 7. Instead, the V-shaped groove 71, the flat part 72, the light reflecting film 73, and the V-shaped groove 141, the flat part 142, the light reflecting film 143, and the colored film 74 are formed on the surface of the light transmissive member 14. A colored film 144 is formed. However, as for the colored film, the colored film may be formed also on the surface of the dial 7, or the colored film may be formed only on the surface of the dial 7 instead of the surface of the light transmissive member 14. .
In addition, since the other part of 2nd Embodiment is as substantially the same as 1st Embodiment, the same code | symbol is attached | subjected to drawing and the description is abbreviate | omitted suitably.

Next, a method for manufacturing the light transmissive member 14 of the solar cell structure 6 will be described with reference to FIG.
First, as shown in FIG. 8A, grooves 1410 having a V-shaped cross section are formed in a lattice shape vertically and horizontally on the surface of a light transmitting member 1400 that is a starting member. At that time, although not particularly limited, the interval between the grooves 1410 is set so that peaks and valleys are alternately formed when viewed from the side.
Next, as shown in FIG. 8B, a metal such as aluminum or chromium is vapor-deposited on the surface of the light transmissive member 1400 to form a light reflecting coating 1430 with a substantially uniform film thickness.
Thereafter, as shown in FIG. 8C, only the tip of the mountain is cut together with the light reflecting coating 1430 by a polishing operation or the like to form the tip of the mountain on a flat surface. Thereby, the flat part 1420 is formed, the flat part 1420 is exposed on the surface, and the light reflecting film 1430 remains only on the inner surface of the valley. The flat portion 1420, the light reflecting coating 1430 and the valley remaining only on the inner surface of the valley finally become the flat portion 142, the light reflecting coating 143, and the valley of the light transmissive member 14, respectively (see FIG. 8D).
Next, a light-transmitting colored film 1440 is formed on the entire surface of the light-transmitting member 1400. The colored film 1440 is formed by printing, for example. The colored film 1440 finally becomes the colored film 144 of the light transmissive member 14 as shown in FIG.
Thereafter, the light transmissive member 14 and the solar cell structure 6 are integrated.

The light transmissive member 14 and the solar cell structure 6 are integrated as follows.
For example, the solar cell 61 is formed in advance smaller than the support substrate 62 and the light transmissive member 14, and the solar cell 61 is sandwiched between the support substrate 62 and the light transmissive member 14. Then, the support substrate 62 and the light transmissive member 14 are bonded with an adhesive. Thereby, the light transmissive member 14 and the solar cell structure 6 are integrated.
Alternatively, adjacent ones of the support substrate 62, the solar cell 61, and the light transmissive member 14 are bonded together with an adhesive. Thereby, the solar cell structure 6 and the light transmissive member 14 are integrated. In this case, when the solar cell 61 and the light transmissive member 14 are bonded, it is preferable to use a light transmissive adhesive. This is because the adhesive adheres to the surface of the solar cell 61, and therefore, in the case of an adhesive that does not have optical transparency, the arrival of light to the solar cell 61 is hindered. Therefore, when an adhesive having no light transmittance is used, it is preferable to bond the solar cell 61 and the light transmissive member 14 at a portion that does not hinder the arrival of light to the solar cell 61 as much as possible.

In addition, the manufacturing method of the light transmissive member 14 is not limited to the above.
For example, the interval between the grooves 1410 having a V-shaped cross section formed on the surface of the light transmissive member 1400 is set so that peaks and valleys are alternately formed when viewed from the side surface. By making the width larger than the groove width, a flat surface may be formed from the beginning between the adjacent grooves 1410.

According to the second embodiment, a part of the external light passes through each flat portion 142 of the light transmissive member 14 and is incident on the solar cell 61. Incident light energy is converted into electric energy, and an electric signal related to the converted electric energy is supplied to a secondary battery or the like disposed inside the housing 5 through a conductive pattern to be charged or stored. Can do.
In addition, a part of the external light is reflected by the light reflecting coating 143 of the groove 141 of the dial 7 and is visually recognized from the outside. In this case, since the light reflecting coating 143 is formed of a metal coating, the portion of the light reflecting coating 143 has a metallic color through the colored film 144 (in this embodiment, the metallic color and the color of the colored film are mixed). As a result, it gives a sense of luxury. In addition, since the way of shining changes depending on the viewing angle and the angle of light, a highly decorative product can be realized.
Further, a part of the light reaching the solar cell 61 by external light is reflected by the surface of the solar cell 61, and among these, the light directed to the groove 141 of the light transmissive member 14 is reflected by the light reflecting film 143 and is light transmissive. Since the light is not emitted to the outside of the member 14 and the dial 7 (that is, shielded by the light reflecting film 143), it is difficult to visually recognize from the outside. Therefore, dark purple which is the ground color of the surface of the solar cell 61 is not conspicuous when viewed from the outside.
Furthermore, according to the second embodiment, since the light transmissive member 14 and the solar cell 61 are integrated by bonding, it is not necessary to adjust the distance between the light transmissive member 14 and the solar cell 61 during assembly. It becomes easy.
Further, according to the second embodiment, since the light transmissive member 14 does not serve as the dial plate 7, it can be easily incorporated into a display device without the dial plate 7.

DESCRIPTION OF SYMBOLS 1 Watch case 2 Watch glass 6 Solar cell structure 61 Solar cell 62 Support board 7 Dial 71 Groove 72 Flat part 73 Light reflection film 74 Colored film 14 Light transmissive member 141 Groove 142 Flat part 143 Light reflection film 144 Colored film

Claims (5)

  In a display device including a solar cell, a support substrate disposed on the back side of the solar cell and supporting the solar cell, and a concave portion formed uniformly on the surface and disposed on the front side of the solar cell, and a light reflecting coating formed on the concave portion. The solar cell, the support substrate, and the light transmissive member are integrated by adhesion.   The display device according to claim 1, wherein the light transmissive member forms a decorative board.   The display device according to claim 1, wherein a light-transmitting colored film is formed on an inner surface of the concave portion and a surface of the flat portion.   The display device according to any one of claims 1 to 3, wherein the display device is a wristwatch, and includes a watch case that houses the light-transmissive member and the support substrate, and a watch glass that covers an upper portion of the watch case. To watch. A method of manufacturing a display device including a solar cell, wherein a groove having a V-shaped cross section is formed on a surface of a light-transmitting member in a lattice shape vertically and horizontally;
Forming a light reflecting film with a predetermined film thickness on the surface of the light transmissive member in which grooves are formed by this step;
By this step, the surface of the light-transmitting member on which the light reflecting film is formed is cut to leave the groove valley portion, and a portion defined by the remaining valley portion is formed on a flat surface to form the flat surface. Removing the light reflecting coating on the surface and leaving the light reflecting coating only on the inner surface of the valley portion;
Arranging a solar cell and a support substrate supporting the solar cell on the back side of the light transmissive member obtained by this step and integrating them by bonding;
A method for manufacturing a display device, comprising:

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